Hey pops1, sorry for the delayed reply. The PEEK is by far the brightest (and loudest), owing to its relatively high density versus other materials out there. The brightness might be a bit much for some. On the brighter end, but less so than the PEEK, is the Resin. It has a sound that is fairly clear and crisp. The casein is the warmest and most balanced of the three in terms of sonic range.
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